Tire.



TIRE.

APPLICATION FILED SEPT-17,1911.

Patented; May 21,1918

like,

"mom a-kn ws ll, amid-.4

inonsnn CGMPANEZ', LIMITED, DFWESTMINSTZFJE, ENGLALND.

hpplication tiled September 1'7, 1917.

To all whom '27:, may concern) v Be it known that l, Conriv ld'aonnrri, a subject at the King: oi ing at ltlanor Mills, Salt'ord street, Aston, Birmingham, .in the county of Warwick, England, have invented certain new and useful improvements in or Relatingto Tires," of. which the following is at specification.

This invention relates to tires oi: the pneul-reat Britain, i'esid' specification of Letters Patent.

niatic or solid type and is especially appli-' cable to tires ton vehicles having three or more Wheels, the chief object being to provide a tire which throughout its life will eil'ectiveiy resist or prevent lateral skidding.

.[iccording to this invention the tread portion of the tire-Cris formed with inwardly directed edges so to 'form angular corners or edges for preventing lateral skidding which do not project beyond the surface of the tread portion, and from each angularcmner or edge each side of the tire is provided with a series of angular portions of similar shape and arrangement to the angular corners or edges of the tire tread thus presenting a hind of serrated, stopped or coxcomb formation at each Side (lit the tire, the said angular portions being adapted, as the tire tread Wears, to successively constitute the angular corners or edges of the tread whereby the tire throughout its life is provided With efficient anti-skidding edges at the tread portion.

The present invention is applicable to all f types and shapes of tires and the exact for ination pit the coxcomh, stopped or serrated sides will to some extent depend. upon the shape tire to whichthe invention is applied. jlhe invention is especlally suitable for solid or other tires which are provided "with plain treads but as hereinafter set forth it is also applicable to tires ofwvhich the treads are formed with studs, grooves or the A as'in many pneumatic tires.

In order that the invention may he clearly understood and readily carried into effect the same Will now he described more fully with reference to the accompanying dra\\'-' inns, in which lFigures l and f2 verse sectional View are respectively a transthrongh and an eleven tionai View of a portion oti a pneumatic tire showing one form of the invention.

Figs. 3 and 4 are similar views to 1 2, illustrating a modification.

Patented May all, tors. serial no. rem ss.

l and (l are respectively a transverse sectional View through and an elevational view of a portion of a solid tire, made in accordance With this invention.

Figs. 7, 8 and 9, are transverse sectional views of different shapes in accordancewith this invention.

In the example shown in Fig. 1, A is the tread or main Wearing part of the tire pro 'vided with a series 0t staggered studs B B and at each side ortion of the tread are specially shaped rilis or projections C C extending eircuinferentially around the tire, constituting the coztcomh or stepped portions. The outer ribs of the coxcoinlo portions form the inwardly directed edges or angular corners of the tread, the said in Wardly directed edges or angular corners serving to arrest or check lateral skidding of the tire and the tread Wears, the ribs v(Q successively fol-n1 theangular corners of the tread, so that the tire throughout its life is always provided with a tread having antislriddin edges. The coxcomh portions or ribs C at each side of the tread are interrupted by transverse grooves D D, the grooves being preferably arranged with relation to the staggered studs in the manner shown in Fig. 2.

In the example shown in Figs. 3 and i the middle part A of the tread is plain and the edges thereof are shaped to form. part of the coxcomb or stepped portions C C as aforesaid. in this example transverse grooves E extend Wholly across the tread so as to inter-' rupt both sets of COXCOIl'll) portions C C and the niiddlepart A of the tr ad, Although the invention is shown in Figs. 1 to 4. applied to tires having patterned or grooved treads, it is especially applicable to tires having plain treads pneumatic tires.

The examples shown in F igs. 5 to 9 illustrate the invention applied to different sections of solid tires having curved, rounded or flat trends, and of different Widths and Widely difi ierent load capacities. In each of these examples A represents the tread or main Wearing part of the tread, and C 0 represent the two coxcomh, stepped or serrated portions which are arranged one on each side of the tread A, 'llheapplication of the coxcomb portions to a solid tire is advantageous for several reasons as hereinafter specified. Usually it is found that anasin solid tires and some a 1,2ce,eee

ordinary solid tire having incross section a rounded or curved contour or tread is very liable to skid because the mud collects at the edges of the tread and wedges under the latter, and consequently it is ditficult for the tire to obtain a firmri 4 or bearing on the road surface. -A solid tire of square or approximately square sect-ionis not so liable to the above objection as it always presents approximately vertical sides or edges to the road surface, but tires of square sections are 'not economical in the use and disposition of the rubber, and moreover are not sufiiciently resilient having regard to the amount of rubber employed. Furthermore many solid tires are used for special work such as motor fire engine service, where the wear is not great but skidding is a great trouble. In such cases a tire with coxcomb sides as shown in Fig. 8 is especially suitable. The present invention enables a solid tire of any section to grip or bear firmly on the road surface so as to mitigate or prevent skidding and at the same time allows of the best possible disposition of the rubber to obtain economy,

resiliency and durability. As shown in all the examples illustrated in the drawings the when the tire is bearing on the road and-is presenting a more or less flat surface thereto, they present ertical or even inwardly inclined surfaces to the'road so as to prevent the mud from collectin or wedging under the tread surface or adjacent to the edges thereof, and this applies to any type or shape of tire to which the invention is applied. The coxcomb portions comprise any number of concentric projections shaped and arranged as shown, which form the inwardly directed edges or angular corners. As the tread surface wears the inwardly inclined or vertical surfaces at the edges of the tire tread are gradually reduced until the tread surface reaches the next concentric projections which form the inwardly directed edges or corners for the tread. In this manner the tire edges retain their original shape tliroughdut the life of the tire. The lower part or base of the tire may be of any desired shape to suit any type of rim. It is essential for efficiency and economy that a tire shall have a suitable shape to stand the loads and conditions under which it works and the present invention enables this to be accomplished; the coxcomb or stepped sides as herein set forth allows of such shape or profileas may be necessary giving the average section required and; also providing throughout the life of the tire effective lat: eral anti-skidding edges.

- I What I claim and desire to secure by Let" ters Patent of the United States is 1. A tire comprising a tread, inwardly directed edges or angular corners at each side of the tread to prevent skidding and a series of portions at each side of the tread, of similar shape and formation to said inwardl) directed edges or angular corners, which portions as the tire wears, successively rism; the same relative shape to the road surface to form anti-skidding edges for the tread during the life of the tire.

'2. A tire comprising a tread, inwardly directed edges or angular corners at each side of the tread'to prevent skidding, concentric annular portions at each side of the tire cl similar shape and formation to said inwardly directed edges or angular corners which portions as the tire wears, successively edges of the tread portions are such thatg/ (present the same relative shape to the road surface to form anti-skidding edges for the tread during the life of the tire.

3. A solid tire having a plain tread inwardly directed edges or corners at each side of the tread to prevent skidding and a serie of stepped portions at the sides of the tire which portions as the tire wears successively present the same relative shape to the road surface to form antiskidding edges for the tread during the life of the tire.

4. A tire comprising a. tread, inwardly directed edges or angular corners at each side of the tread to prevent skidding, concentric annular portions at each side of the tread of: similar shape and formation to said inwardly directed or angular corners, which portions as the tire wears, successively present the same relative shape to the road surface to form anti-skidding edges for the tread during the life of tire, the successive annular portions being of greater distances from the center of said tire so that as the tire wears the wearing surface increases in area.

COLIN MAC-BETH. 

